Acoustic Solutions TV - Stuck on Standby

[budm]

Re: Acoustic Solutions TV - Stuck on Standby

OK, I look at the diagram, CN117:
PIN18 12V_VCC
PIN20: DIMMIN CONTROL
PIN22: BL-ON
So you are saying they show as shorted to ground with <1 Ohm reading?
Are you sure you are not looking at the GND pins?
Also as posted in post 1 the Voltages for the 24v, 12V, etc. are low.
"I have tested PL816 for output and i got the following :
ST_BY 2.1V
+12V_1 - 3.5V
+5v STBY - ok
+3.3V STBY - ok
+24v - 16v
+12v - 4v
+33v - 15v
+3.3v - ok
+5v - 2.1V
+24V A - 16V
+30V - 16V"

[qussy101]

Re: Acoustic Solutions TV - Stuck on Standby

oki..
in 17bm35 schematic you have CN117 and CN126 it's a little bit different .. in PL816

in pl816 ( 3.3v) is 18,20,22 .. in cn117 it's 8,10,12 .

[budm]

Re: Acoustic Solutions TV - Stuck on Standby

17mb35-1 schematic download link here ..



i'm working on it .. let's us investigate together

So what is the PL816? I thought we are looking at 17bm35 diagram.
Where is this PL816 in the diagram?

[budm]

Re: Acoustic Solutions TV - Stuck on Standby

OK, I download the sch of the power supply. So pin 18, 20, 22 (VCC_3V3_ON) of the PL816 of the power supply board are showing as shorted to GND not the 18, 20, 22 of the CN117 of the main board as indicated in the other post, right?
The PL816 pins to the CN117 are not pin to pin connections, for example: Pin 1, 2, 3, 7, 9 (GNDs) of PL816 are connected to pin 27 , 25, 23, 21, 19 of CN117.
Basically Pin1 of PL816 is the same (CONNECTED TO) as Pin 27 of CN117.
Pin 2 of PL816 is the same as Pin 28 of CN117.

[budm]

Re: Acoustic Solutions TV - Stuck on Standby

BTW, per OP:
"I have tested PL816 for output and i got the following :
ST_BY 2.1V
+12V_1 - 3.5V
+5v STBY - ok
+3.3V STBY - ok
+24v - 16v
+12v - 4v
+33v - 15v
+3.3v - ok
+5v - 2.1V
+24V A - 16V
+30V - 16V"

if the 3.3V pins are shorted to GND, he will not have 3.3V per his reports in post 1.

[claudyu07]

Re: Acoustic Solutions TV - Stuck on Standby

OK, I download the sch of the power supply. So pin 18, 20, 22 (VCC_3V3_ON) of the PL816 of the power supply board are showing as shorted to GND not the 18, 20, 22 of the CN117 of the main board as indicated in the other post, right?
The PL816 pins to the CN117 are not pin to pin connections, for example: Pin 1, 2, 3, 7, 9 (GNDs) of PL816 are connected to pin 27 , 25, 23, 21, 19 of CN117.
Basically Pin1 of PL816 is the same (CONNECTED TO) as Pin 27 of CN117.
Pin 2 of PL816 is the same as Pin 28 of CN117.

pin 18, 20, 22 (VCC_3V3_ON) of the PL816 of the power supply board are going into motherboard CN117 into pin 8, 10 , 12.

I have disconnected the wires who makes the connection from power supply 18,20,22 to motherboard CN117 pins 8,10,12 and now board stops ticking every 1 second and SPDIF stops flashing.

With the wires connected i get no Voltage but disconnected i get proper voltage on VCC_3V3_ON

[qussy101]

Re: Acoustic Solutions TV - Stuck on Standby

So .. have you schematic ? .. did you find the problem .. ?

i don't have time to check for the problem .. so if u find anything tell us please

[CapLeaker]

Re: Acoustic Solutions TV - Stuck on Standby

"With the wires connected i get no Voltage but disconnected i get proper voltage on VCC_3V3_ON"

So there is a short then

[budm]

Re: Acoustic Solutions TV - Stuck on Standby

"With the wires connected i get no Voltage but disconnected i get proper voltage on VCC_3V3_ON"

So there is a short then

That is why it is confusing to me when in post 1 the report is:
"I have tested PL816 for output and i got the following :
ST_BY 2.1V
+12V_1 - 3.5V
+5v STBY - ok
+3.3V STBY - ok
+24v - 16v
+12v - 4v
+33v - 15v
+3.3v - ok
+5v - 2.1V
+24V A - 16V
+30V - 16V"

So now it is clear that the Voltages were tested without main board connected (post 27).
it was also confusing when OP stated that "you are right. i have disconnected pins 18,20,22 from CN117" which should be CN117 pins 8,10,12.
So now i need to see where those 3V3_ON (3V3_VCC) pins are feeding circuits on the main board.
So what resistance do you get between CN117 pins 8,10,12 and GND? 0 Ohms? 10 Ohms?

[qussy101]

Re: Acoustic Solutions TV - Stuck on Standby

there's a regulator U121 shorted to GND .. i remove it and nothing happen still shorted .
also c506 shorted ... Ufff

[finntricky]

Re: Acoustic Solutions TV - Stuck on Standby

i have been following this problem with the hope that someone fixes it,
i have the same problem with a sanyo,32, same power supply same main board,
i give up. lol

[budm]

Re: Acoustic Solutions TV - Stuck on Standby

OK, I trace out what 3V3_VCC circuits, it is used for feeding pin 52 of U1 (PAGE 11 of the SCH). So it is either U1 is shorted out or the MLCC are shorted out.

[budm]

Re: Acoustic Solutions TV - Stuck on Standby

there's a regulator U121 shorted to GND .. i remove it and nothing happen still shorted .
also c506 shorted ... Ufff

What page is U121 is on the main board diagram?

[budm]

Re: Acoustic Solutions TV - Stuck on Standby

OK, I see u121 (x1117 adjustable output LDO regulator) on page 10, but as I indicated 3V3_VCC is also feed U1 PIN 52 also.
BTW, the SCH shows 3v3_STBY also feeds U121 which to me, that must be an error.
So what is the resistance reading against gnd?

[Alastair E]

Re: Acoustic Solutions TV - Stuck on Standby

Just a note--

These VESTEL VOMIT PSU's being really Utter Crap--Dont like running with little or no load attached--They do weird stuff!

[qussy101]

Re: Acoustic Solutions TV - Stuck on Standby

yes u r right ...

[budm]

Re: Acoustic Solutions TV - Stuck on Standby

BTW, The Voltage source for the 3V3_VCC is from 3V3 STANDBY power supply through switched MOSFET (IC824 on the power supply board), so if it really dead shorted to GND the MOSFET will be damaged.

[CapLeaker]

Re: Acoustic Solutions TV - Stuck on Standby

pin 18, 20, 22 (VCC_3V3_ON) of the PL816 of the power supply board are going into motherboard CN117 into pin 8, 10 , 12.

I have disconnected the wires who makes the connection from power supply 18,20,22 to motherboard CN117 pins 8,10,12 and now board stops ticking every 1 second and SPDIF stops flashing.

With the wires connected i get no Voltage but disconnected i get proper voltage on VCC_3V3_ON

That is why it is confusing to me when in post 1 the report is:
"I have tested PL816 for output and i got the following :
ST_BY 2.1V
+12V_1 - 3.5V
+5v STBY - ok
+3.3V STBY - ok
+24v - 16v
+12v - 4v
+33v - 15v
+3.3v - ok
+5v - 2.1V
+24V A - 16V
+30V - 16V"

So now it is clear that the Voltages were tested without main board connected (post 27).
it was also confusing when OP stated that "you are right. i have disconnected pins 18,20,22 from CN117" which should be CN117 pins 8,10,12.
So now i need to see where those 3V3_ON (3V3_VCC) pins are feeding circuits on the main board.
So what resistance do you get between CN117 pins 8,10,12 and GND? 0 Ohms? 10 Ohms?

don't worry... gonna be like the other one.... a veeeery long confusing thread.

[claudyu07]

Re: Acoustic Solutions TV - Stuck on Standby

Resistance to Ground is 8 ohms pins 8,10,12 to ground

[budm]

Re: Acoustic Solutions TV - Stuck on Standby

So that will be about 0.412A of current.
Well, you have to start removing parts connected to the 3V3_VCC to find out where the 8 ohms is coming from.